In this extended audio clip we HEAR the TS-520 speech processor audio—described in a Substack article—working a 40 meter European pile-up on February 26, 2019 at around 5:45 PM Eastern Standard Time. The recording is of interest because we can hear the speech processor effectively eliminating the breaths of the operator, as well as all background fan noise and room tone from the transmitted audio. Although the amount of compression dialed in is arguably excessive, there is no distortion.
Compare the transmit audio with the audio of DX stations, many of which laden with breathing artifacts, room tone, fan noise, etc.
NOTES:
The transmit audio was recorded from an ICOM IC-706MKIIG tuned to the transmit frequency of the TS-520.
The antenna is a pair of homemade phased verticals in a saltwater marsh adjacent to the ocean in southern Rhode Island.
The “clicking” artifact heard when the operator switches between receive and transmit are dirty relays in a TS-520. Not the T/R changeover relay. But the one(s) soldered deep in the heart of the radio’s circuitry. 8(
The TS-520 being used was completely re-capped and realigned just prior to the recording.
Speech Processor Audio: Sample #I